AN INVESTIGATION ON GRAIN YIELD STABILITY OF WHEAT VARIETIES AT DIFFERENT PLANTING DATESMohammad Sharifi- Alhosini
The experiment was carried out to investigate grain yield stability of eight wheat varieties (Marvdasht, Cross Arvand, Mahdavi, Pishtaz, Falat, Shiraz, Chamran, Back cross Roshan) at five planting dates, at agricultural and resources research center of Neyshabour, during 2009-2011. Five separate randomized complete blockdesigns with three replications carried out in different planting date. Each planting date considered as an environment. Combined analysis of variance for years and environments was carried out. Year-genotype interaction (p<0.01) and year-environment-genotype (p<0.05) were significant in respect of grain yield. Grain yield did not affect by environment-genotype interaction. Stability analysis carried out using univariate parameters of type 1, 2 and 3. Chamran and Cross Arvand showed higher yield stability based on environmental variability coefficient and environmental variance (type 1 stability parameters). Falat introduced as highest stable genotype base on Eberhart& Russells joint regression, Wrickesecovalenceand Shuklas stability variance parameters. Results showed that Falat and Chamran were the least sensitive genotypes in respect of planting date, While Shiraz was the most sensitive genotype with least yield stability.
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